From: Garey Barrell 
Subject: Re: [drakelist] TR7 TX when power on


Garey Barrell  made an utterence to the drakelist gang
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Ron -

Anything is possible under those conditions! 

There are hundreds of electrolytic caps in there that take varying times 
to discharge when power is turned off.  When power is reapplied quickly, 
some cap in the T-R logic circuitry still has a charge that is 
sufficient to say "transmit" !!

There is a known condition that at INITIAL turn-on the TR-7 "can" 
momentarily key the transmitter.   The attached mod will stop this, but 
probably won't have any effect on the quick recycle.

Simple answer is DON'T DO THAT!!  :-)

73, Garey - K4OAH
Atlanta

Ron Wagner wrote:

>
> Ron Wagner  made an utterence to the drakelist gang
> ----------------------------------------------------------------------
> Guys,
> Just noticed today a minor issue that I need information on.
>
> When I turn the TR7 off and then within say 20 seconds back on, the 
> rig goes into TX.  Relay pulls in and power goes out while in AM, USB, 
> LSB. Relay kicks, but now power out while in RTTY and CW mode. If I 
> wait say several minutes this does not happen. I don't normally off/on 
> the rig like this, but it happened today, so it might happen again.  
> My TR7 is attached to a PS7.  Both are basic "stock" with only 
> standard "Drake mods".
>
> Is this normal, or is it something I need to look into before it gets 
> worse?
>
> 73,
> Ron
>
> ============================================================
> Visit my astronomy home page.   http://www.dma.org/~wagner
> Amateur Radio Station: WD8SBB - Ron  and  KB8NRP - Joann
> ============================================================
>

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